tracing: Add entry->next_cpu to trace_ctxwake_bin()

Function trace_ctxwake_bin() misses ctx_switch_entry->next_cpu field,
so user will get stale value for "next_cpu".

Link: http://lkml.kernel.org/p/1377176379-27908-1-git-send-email-liuj97@gmail.com



Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>